Sumar DistrictSumar District is in Qasr-e Shirin County, Kermanshah province, Iran. Its capital is the city of Sumar.DemographicsPopulationAt the time of the 2006 National Census, the district's population was 247 in 79 households. The following census in 2011 counted 1,524 people in 85 households. The 2016 census measured the population of the district as 557 inhabitants in 45 households.